Viagra causes dilation of blood vessels and increased blood flow to the penis, facilitating erection. Viagra acts by inhibiting which of the following events?

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#Question id: 11198

#Unit 7. System Physiology – Animal

The "undershoot" phase of hyperpolarization is due to ________.

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#Question id: 11199

#Unit 7. System Physiology – Animal

The fastest possible conduction velocity of action potentials is observed in ________.

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#Question id: 11200

#Unit 7. System Physiology – Animal

Action potentials are normally carried in only one direction: from the axon hillock toward the axon terminals. If you experimentally depolarize the middle of the axon to threshold, using an electronic probe, then ________.

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#Question id: 11201

#Unit 7. System Physiology – Animal

Why are action potentials usually conducted in one direction?

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#Question id: 12069

#Unit 7. System Physiology – Animal

Post-tetanic facilitation is thought to be the result of

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#Question id: 12068

#Unit 7. System Physiology – Animal

Prolonged changes in neuronal activity are usually achieved through the activation of